Value of swallows as insect destroyers
By: by H.W. Henshaw
Contributors: United States. Bureau of Biological Survey
Series: Bureau of Biological Survey, Circular -- No. 56; Circular (United States. Bureau of Biological Survey) -- no. 56.
Publisher: [Govt. Print. Off.]
Published: 1907
Place of publication: [Washington, D.C.]
Language: eng
Subjects: Swallows; Predation (Biology)
Notes: "Issued April 27, 1907."